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6*x-(x*((4*x-1)/2))-5 = 0
(-1*x*(4*x-1))/2+6*x-5 = 0
(-1*x*(4*x-1))/2+(2*6*x)/2+(-5*2)/2 = 0
2*6*x-1*x*(4*x-1)-5*2 = 0
13*x-4*x^2-10 = 0
13*x-4*x^2-10 = 0
13*x-4*x^2-10 = 0
DELTA = 13^2-(-10*(-4)*4)
DELTA = 9
DELTA > 0
x = (9^(1/2)-13)/(-4*2) or x = (-9^(1/2)-13)/(-4*2)
x = 5/4 or x = 2
(x-5/4)*(x-2) = 0
((x-5/4)*(x-2))/2 = 0
((x-5/4)*(x-2))/2 = 0 // * 2
(x-5/4)*(x-2) = 0
( x-2 )
x-2 = 0 // + 2
x = 2
( x-5/4 )
x-5/4 = 0 // + 5/4
x = 5/4
x in { 2, 5/4 }
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